Anchor stock and archimedes’ screw: what they have in common

1. Step 1. Anchor stock — is part of — Anchor. The crossbar turns the flukes downward.
2. Step 2. Anchor — has part — Shackle. The chain mount.
3. Step 3. Shackle — is part of — Micrometer. A rigid frame.
4. Step 4. Micrometer — uses — Screw. A precise screw with a 0.5 mm pitch.
5. Step 5. Screw — is used in — Archimedes’ screw. A rotating helical surface lifts water.

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